Sodium dithionate

Structural formula
General
Surname	Sodium dithionate
Molecular formula	Na 2 S 2 O 6
Brief description	colorless solid; colorless rhombic crystals (dihydrate);
External identifiers / databases
EC number	231-550-1
ECHA InfoCard	100,028,682
PubChem	146045
Wikidata	Q955503
properties
Molar mass	206.11 g mol −1
Physical state	firmly
density	2.19 g cm −3
Melting point	200 ° C (decomposition)
solubility	soluble in water (13.39% by weight at 20 ° C)
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium dithionate is an inorganic chemical compound of sodium from the group of dithionates .

Extraction and presentation

Sodium dithionate can be obtained by reacting manganese dithionate (represented by the reaction of manganese dioxide with sulfur dioxide ) with sodium carbonate .

{\ displaystyle \ mathrm {MnO_ {2} +2 \ SO_ {2} \ longrightarrow MnS_ {2} O_ {6}}}

{\ displaystyle \ mathrm {MnS_ {2} O_ {6} + Na_ {2} CO_ {3} \ longrightarrow Na_ {2} S_ {2} O_ {6} + MnCO_ {3}}}

Alternatively, it can also be prepared by reacting a hot barium dithionate solution with sodium carbonate or sodium sulfate .

{\ displaystyle \ mathrm {BaS_ {2} O_ {6} + Na_ {2} CO_ {3} \ longrightarrow Na_ {2} S_ {2} O_ {6} + BaCO_ {3}}}

{\ displaystyle \ mathrm {BaS_ {2} O_ {6} + Na_ {2} SO_ {4} \ longrightarrow Na_ {2} S_ {2} O_ {6} + BaSO_ {4}}}

properties

Sodium dithionate is a colorless, very air-stable solid that is easily soluble in water and insoluble in alcohol. It is in the form of a dihydrate which, when heated to between 60 and 110 ° C, releases the water of crystallization . Above 200 ° C, quantitative decomposition into sodium sulphate and sulfur dioxide takes place. The dihydrate has an orthorhombic crystal structure with the space group Pnma (space group no. 62) . Template: room group / 62

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 395.
↑ ^a ^b entry on dithionates. In: Römpp Online . Georg Thieme Verlag, accessed on July 23, 2015.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
^ Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 624 ( limited preview in Google Book search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 395.

[Roempp-2] try on dithionates. In: Römpp Online . Georg Thieme Verlag, accessed on July 23, 2015.

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Jean_d’Ans,_Ellen_Lax,_Roger_Blachnik-4] Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 624 ( limited preview in Google Book search).